Three-dimensional analysis of BaZrO3 pinning centers gives isotropic superconductivity in GdBa2Cu3O7−δ

Solution derived La 2 Zr 2 O 7 films have drawn much attention for potential applications as thermal barriers or low-cost buffer layers for coated conductor technology. Annealing and coating parameters strongly affect the microstructure of La 2 Zr 2 O 7 , but different film processing methods can yield similar microstructural features such as nanovoids and nanometer-sized La 2 Zr 2 O 7 grains. Nanoporosity is a typical feature found in such films and the implications for the functionality of the films is investigated by a combination of scanning transmission electron microscopy, electron energy-loss spectroscopy and quantitative electron tomography. Chemical solution based La 2 Zr 2 O 7 films deposited on flexible Ni-5at.%W substrates with a {100}<001> biaxial texture were prepared for an in-depth characterization. A sponge-like structure composed of nanometer sized voids is revealed by high-angle annular dark-field scanning transmission electron microscopy in combination with electron tomography. A three-dimensional quantification of nanovoids in the La 2 Zr 2 O 7 film is obtained on a local scale. Mostly non-interconnected highly facetted nanovoids compromise more than one-fifth of the investigated sample volume. The diffusion barrier efficiency of a 170 nm thick La 2 Zr 2 O 7 film is investigated by STEM-EELS yielding a 1.8 ± 0.2 nm oxide layer beyond which no significant nickel diffusion can be detected and intermixing is observed. This is of particular significance for the functionality of YBa 2 Cu 3 O 7-δ coated conductor architectures based on solution derived La 2 Zr 2 O 7 films as diffusion barriers.

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“…In this case, the quantification of pinning relevant secondary phases is limited due to missing wedge artifacts and under sampling. [28][29][30]…”

Section: Resultsmentioning

confidence: 99%

Barrier efficiency of sponge-like La₂Zr₂O₇buffer layers for YBCO-coated conductors

Molina

Tan

Biermans

et al. 2011

Supercond. Sci. Technol.

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“…They suggested that much higher stacking faults and screw dislocations in the undoped GdBCO film compared with those of the undoped YBCO film played a role of c-axis-correlated pinning centers, which are responsible for the small broad J c (θ) peak for B//c. Recently, Kaneko et al [10] clearly reported the presence of screw dislocations, in addition to the stacking faults.…”

Section: Methodsmentioning

confidence: 99%

“…With regard to this point, the J c -B characteristics of the GdBCO films have been improved by introducing nanosized nonsuperconducting particles into the GdBCO superconducting matrix. Up to date, various doping materials, including yttriastabilized ZrO 2 [3], [4], Au [5], BaZrO 3 (BZO) [6]- [10], BSO [11]- [13], and BaHfO 3 (BHO) [14], [15], have been incorporated into the GdBCO films by PLD and found effective for the enhancement of their J c -B properties for B//c. Among these materials, BZO is the most extensively studied one not only for GdBCO films but also for YBCO [16]- [18] and other REBa 2 Cu 3 O y (REBCO, RE: rare earth elements) films such as RE = Sm [19], Nd [20], and Er [21].…”

mentioning

confidence: 99%

Optimization of the <formula formulatype="inline"><tex Notation="TeX">$\hbox{BaSnO}_{3}$</tex></formula> Doping Content in <formula formulatype="inline"><tex Notation="TeX">$\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$</tex> </formula> Coated Conductors by Pulsed Laser Deposition

Choi

Lee

et al. 2014

IEEE Trans. Appl. Supercond.

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We tried to optimize the BaSnO 3 (BSO) doping content in GdBa 2 Cu 3 O 7−δ (GdBCO) coated conductors (CCs) on CeO 2 -buffered ion-beam assisted deposition (IBAD)-MgO templates. The BSO-doped GdBCO CCs with various x vol% (x = 0, 2, 3, 4, 5, and 6) relative to GdBCO were prepared at 800 • C with the oxygen pressure of 300 mtorr by pulsed laser deposition (PLD), and their pinning properties were characterized by measuring magnetic hysteresis curves for the applied field parallel to the c-axis of GdBCO (B//c) up to 5 T and fieldorientation dependence of transport critical currents for 1, 3, and 5 T at 65 and 77 K, respectively. Among all samples, a 5 vol% BSO-doped GdBCO CC exhibited the highest maximum pinning force density (F p,max ) values of 32.5 GN/m 3 near 4 T at 65 K and 6.5 GN/m 3 near 3.2 T at 77 K, for B//c (θ = 180 • ), and also the highest minimum transport critical current density (J c,min ) of 0.39 MA/cm 2 at 77 K in 1 T and 0.68 MA/cm 2 at 65 K in 3 T, for θ = 120 • , evidencing that 5 vol% is the optimum BSO content. Observation of BSO-doped GdBCO CCs by transmission electron microscopy revealed that the effective flux pinning of BSO-doped GdBCO CC was attributed to the BSO nanorods of ∼10-nm diameters roughly aligned along the c-axis of the GdBCO matrix. Index Terms-BaSnO 3 (BSO) nanorods, field-orientation dependence of J c , GdBa 2 Cu 3 O 7−δ (GdBCO), pinning force density, transmission electron microscopy (TEM).

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“…В частности, в работах [12,13] было показано, что наночастицы BaZrO 3 имеют высокие перспективы как кандидаты в инертные центры пиннинга. Исследования по созданию искусственных центров пиннинга на основе нанодобавок проводились для ВТСП-пленок, полученных различными методами: импульсного лазерного напыления [14,15,16], металлоорганического осаждения жидких прекурсоров [17,18], осаждения металлорганических соединений из газообразной фазы [10,11,[19][20][21][22][23]. Наряду с монодобавками, рассматривался способ создания структур с комбинацией точечных и колончатых дефектов [24].…”

Section: Introductionunclassified

Увеличение Критического Тока Сверхпроводящих Композитов При Имплантации Ионов Железа

Руднев¹,

Подливаев²,

Абин³

et al. 2023

Физика Твердого Тела

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The results of studying the effect of ion irradiation (Fe2+ ions E=5.6 MeV) in the modes of creating radiation defects and implantation on the critical current of high-temperature superconducting (HTS) composites are presented. An analysis was made of both the integral critical current obtained from measurements of the total magnetization of the samples and the local critical current determined from the data of scanning Hall magnetometry. It is shown that at the same ion fluence Ф=2‧1013 cm-2, an increase in the critical current Jc is observed in the ion implantation regime, while in the regime of radiation defects, a slight drop in Jc is observed. This circumstance indicates an enhancement of pinning due to the additional magnetic interaction of Abrikosov vortices with magnetic ions implanted in the HTS layer.

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Three-dimensional analysis of BaZrO3 pinning centers gives isotropic superconductivity in GdBa2Cu3O7−δ

Cited by 27 publications

References 21 publications

Barrier efficiency of sponge-like La₂Zr₂O₇buffer layers for YBCO-coated conductors

Barrier efficiency of sponge-like La₂Zr₂O₇buffer layers for YBCO-coated conductors

Optimization of the <formula formulatype="inline"><tex Notation="TeX">$\hbox{BaSnO}_{3}$</tex></formula> Doping Content in <formula formulatype="inline"><tex Notation="TeX">$\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$</tex> </formula> Coated Conductors by Pulsed Laser Deposition

Увеличение Критического Тока Сверхпроводящих Композитов При Имплантации Ионов Железа

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Three-dimensional analysis of BaZrO3 pinning centers gives isotropic superconductivity in GdBa2Cu3O7−δ

Cited by 27 publications

References 21 publications

Barrier efficiency of sponge-like La2Zr2O7buffer layers for YBCO-coated conductors

Barrier efficiency of sponge-like La2Zr2O7buffer layers for YBCO-coated conductors

Optimization of the <formula formulatype="inline"><tex Notation="TeX">$\hbox{BaSnO}_{3}$</tex></formula> Doping Content in <formula formulatype="inline"><tex Notation="TeX">$\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{7-\delta}$</tex> </formula> Coated Conductors by Pulsed Laser Deposition

Увеличение Критического Тока Сверхпроводящих Композитов При Имплантации Ионов Железа

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Barrier efficiency of sponge-like La₂Zr₂O₇buffer layers for YBCO-coated conductors

Barrier efficiency of sponge-like La₂Zr₂O₇buffer layers for YBCO-coated conductors